A number calculated from your height and weight (weight in kg ÷ height in m²) used as a rough screening tool for weight categories — generally 25–29.9 is "overweight" and 30+ is "obesity." Insurers and FDA labels often use BMI thresholds to decide coverage and eligibility (for example, a GLP-1 may be labeled for BMI 30+, or 27+ with a weight-related condition). BMI is a blunt instrument that ignores muscle and body composition, but it's the gatekeeping number in practice.
Related terms: Comorbidity · Lean mass loss